The National Calligraphers Association must be 18 years old or older.
Participate in calligraphy exhibitions or competitions sponsored or co-organized by the National Calligraphers Association. If you are selected for more than two times or won more than one prize, you can submit an application to the Calligraphy Association ~
The local area is relatively loose, but it must also be selected or awarded in the calligraphy competition organized by the local calligraphy association.
The shortest way is the competition sponsored by China Calligraphers Association, which refers to the authoritative competition only a few times a year. If you get a grade award, you are eligible to participate.
It would be easy if someone in the association recommended it.